/*
 * Copyright 2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.seppiko.pigeon.authorizations;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.seppiko.pigeon.models.ResponseMessageEntity;
import org.seppiko.pigeon.utils.JsonUtil;
import org.springframework.http.MediaType;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.authentication.www.BasicAuthenticationEntryPoint;
import org.springframework.stereotype.Component;

/**
 * @author Leonard Woo
 */
@Slf4j
@Component
public class PigeonBasicAuthenticationEntryPoint extends BasicAuthenticationEntryPoint {

  @Override
  public void commence(HttpServletRequest request, HttpServletResponse response,
      AuthenticationException authException) throws IOException {

    response.addHeader("WWW-Authenticate", "Basic realm=\"" + getRealmName() + "\"");
    response.addHeader("Content-Type", MediaType.APPLICATION_JSON_VALUE);
    response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
    String json = JsonUtil.toJson(
        new ResponseMessageEntity(401, "FILTER: Failed to obtain authorization.") );
    response.setContentLength(json.length());

    final PrintWriter writer = response.getWriter();
    writer.println(json);
    writer.flush();

    log.warn(authException.getMessage());
  }

  @Override
  public void afterPropertiesSet() {
    setRealmName("Pigeon");
    super.afterPropertiesSet();
  }
}
